public static RotationalStiffness NanonewtonMillimetersPerDegree <T>(this T value) =>
 RotationalStiffness.FromNanonewtonMillimetersPerDegree(Convert.ToDecimal(value));
 public void NumberToNanonewtonMillimetersPerDegreeTest() =>
 Assert.Equal(RotationalStiffness.FromNanonewtonMillimetersPerDegree(2), 2.NanonewtonMillimetersPerDegree());